It humbles you because you're not so focused on the KDA and more on keeping your team alive. Nobody really notices how much a Support does because Mid is too busy chasing a kill or diving under turret and then they're alive? Sona came in with the heals, Godraka ulted for you, or Morgana binded the enemy team coming after you.
As a Support, you're less about the micro play of laning and more of the macro play of map control. This means vision, keeping track of objectives, and cooldowns of enemy abilities/spells. Yes you got 13-0, but look at your Support Naut who stole baron, took four towers and got wards in the enemy jungle prepping for dragon.